Adjustable reamer.



S. H. NORTON.

ADJUSTABLE REAMER.

APPLICATION FILED APR. 11. 1911.

1,250,630. Patented Deb.18 ,1917.

I WITNESSES IN VE/V TOR M /1 T TOR/V5 V8 I J/f/XO/i Tg/Y,

SAT-S T SAMUEL HARRY NORTON, or MEAIDVILLE, rENNsYLvANI ,:.AssIoNon TO THE McoRosKEY REAMEBCQ, OF-MEAIDVILLE, PENNSYLVANIA, A ooRPonATro OF PENNSYLVANIA.

ADJUSTABLE EAMER.

' of Meadville, in the county of Crawford and State of Pennsylvania, have invented a certain new and useful Improvement in Ad justable Reamers, of which the following is a specification.

My present invention relates generally to reamers, and more particularly to an adjustable reamer, my object generally being the provision of an improved device of this nature involving a construction wherehy'the v cutters may be effectively secured and clamped adjacent their forward outer ends,

and a compact arrangement involving"'af minimum number of parts is at the sane time promoted.

A further object of my invent'ionfisito provide a construction including; 'a"comb1 ,'f

nation of special parts whereby an small reamer may be placed u 'cn' the market at minimum cost and without dang er 'b f chattering in use. j v

These and other-objects residing for the meet P in t ed t ls of. cqn tmctiqn, rangement, a1id"'operation inwhitihmy v vention in its specific aspect lies, will loe' better understood from the following description in which reference is made to the accompanying drawings forming a part of this specification, wherein:

Figure l is a side elevation of my improved adjustable reamer; I

Fig. 2 is a vertical longitudinal section through the forward end of the effective operating parts thereof;

Fig. 3 is a front elevation, and

Fig. 4 is a cross section taken substantially on line H of Fig. 2.

Referring now particularly to these figures, my improved reamer includes a handle portion 10 cylindrical in form, which in the present instance, as particularly shown in Fig. 2, is provided at its forward end with an enlarged axial bore 11 receiving the rear cylindricalextensicn 12 of the reamer shank 13, onto which extension 12 the forward portion of the handle is shrunk. It is to be understood that my invention is not limited to such a construction, as it is possible to form the handle 10 integrally with the shank 13 in sizes where the shank-is of greater diameter than that ofthe handle.

At its forward end the shank 13 has an s ecificatida 6f LettersQPatentr t t d Application filed A ril-17,1917." se ia1No.ie2,5es.

enlarged --cylindrical head 5 14, andwie'e ternally threaded at15 betweenitsextensioii' 12 and the said head, forthereceptioniof an adjusting ring 16 which isi'nternallytliread ed, as seen in Fig. 2, to eoeperatewinrt threads 15 of the shank, and which is iniov- V able upon the threaded 'tio'n"of tlie'sh'aiik for. the full league-cutlets? The threaded pardon-15 fthes' and the 'he'a cllesfftherepf 'are longitudin a ext'endinggi oov y f li t ii e -l' efbe w ch? grooves *taper ifrom the, naively-standarforward "ends at the forward ends 0 14 totherelatively deep ends adjace' 'ttihe elirktdedd'rtitirfld f the,

eds es "e2: teenager ardjend o 0 bjf i iese ct automate; v

eeierear ease s0 as e esi The head 1 1 is, furthermore. throughout its length, the slots indicated at 21 extending inwardly therethrough from the bases of the grooves 17 to the axial bore 22 of said head, so as to thus form relatively adjustable segments 23. as particularly seen by a comparison of Figs. 2 and 3, adjustment of which toward one another serve to firmlv and effectively clamp theforward effective ends of the cutters 18.

To this end the head 14: has diametrical openings through its segments at right angles to one another, and at points spaced longitudinally of the head adjacent its for-' Ward end, for the reception of clamping screws 24:, the openings of certain of th segments being threaded to receive the threaded portions of the screws, as seen in Fig. 3, with the opposite openings counter, bored so as to countersink theheads of the screws. 1

Thus, in adjusting the cutters18 it is simply necessary to loosen the clamping screws 24 and turn the adjusting ring 16 more or less, as desired. to force the cutters forwardly by virtue ofsuch movement of the adjusting ring, and outwardly at the same time by virtue of the eoactingtapered slotted edges of the cutters and bases of the grooves 17. The clamping screws 24 are then tightened to effectively clamp the cutters adjacent their forward ends.

It is further to be noted from Fig. 1 that the grooves of the cutters, and consequently the cutters themselves, extend in slightly angular positions relatively to the longitudinal axis of the reamer, with their forward effective ends inclined away from the direction of rotation of the reamer in use, so as to thus defeat any tendency of the reamer to feed itself forwardly in use and, with the effective clamping of the forward ends thereof, eliminate all danger of chattering.

It is obvious that from the construction described, I am enabled to provide an effective reamer of small diameter in which a minimum number of parts are employed and a minimum number of cutters necessitated, although it will be understood that my invention is not to be limited to the use of four cutters, as shown in the drawings.

I claim:

1. An adjustable reamer including a threaded shank, having a head at its outer end, and provided with lengthwise grooves therealong and along the headhaving tapering bases, an adjusting ring threaded upon the shank, cutters disposed in the said grooves and having tapering inner edges cooperating with the tapered bases of the grooves, said head having an axial bore, and slots extending from the said grooves and the said bore for substantially the length of the head to form segments between the outer ends of the cutters, and clamping screws extending diametrically through the head whereby to connect the said segments and securely clamp the outer portions of the cutters thereby.

2. An adjustable reamer including a threaded shank having a head at its forward end, the latter of which has a series of integral segments, said shank and its head having tapering cutter receiving grooves, cutters disposed in the said grooves, an adj usting ring threaded upon the shank to engage the rear ends of the cutters, and clamping screws extending diametricallythrough the head at longitudinally spaced points near the forward end thereof, whereby to connect the segments of the head and securely clamp the forward portions of the cutters thereby.

'3. An adjustable reamer including 'a threaded shank having an enlarged longitudinal split and longitudinally bored head at its forward end, said shank and its head having external longitudinal cutter receiving grooves, cutters disposed in the grooves, an adjusting ring threaded on the shank and engaging the rear ends of the cutters, and clamping means extending diametrically through the head and connecting the split portions thereof for clamping the forward ends of the said cutters.

SAMUEL HARRY NORTON.

Copies at this patent may be obtained for five cents each, by addressing the Commissioner of Eatents,

Washingtomlhti." 

